Given the abstract class , RentableDwelling, containing: a (private ) double instance variable , rentPerUnit a constructor accepting a double used to initialize rentPerUnit a method , getRentPerUnit that returns the value of rentPerUnit an abstract method getRentalIncome that returns a double write a (non-abstract) subclass, ApartmentHouse, containing: an int instance variable numberOfApartments a constructor accepting a double , passed to the superclass constructor , and an int used to initialize numberOfApartments the method getRentalIncome calculated as the product of numberOfApartments and the rent per unit. getRentalIncome returns a double.
LANGUAGE: JAVA
CHALLENGE:
Given the abstract class , RentableDwelling, containing:
a (private ) double instance variable , rentPerUnit
a constructor accepting a double used to initialize rentPerUnit
a method , getRentPerUnit that returns the value of rentPerUnit
an abstract method getRentalIncome that returns a double
write a (non-abstract) subclass, ApartmentHouse, containing:
an int instance variable numberOfApartments
a constructor accepting a double , passed to the superclass constructor , and an int used to initialize numberOfApartments
the method getRentalIncome calculated as the product of numberOfApartments and the rent per unit. getRentalIncome returns a double.
SOLUTION:
public class ApartmentHouse extends RentableDwelling { private int numberOfApartments; public ApartmentHouse (double rentPerUnit, int numUnits) { super(rentPerUnit); numberOfApartments = numUnits; } public double getRentalIncome() { return(getRentPerUnit()*numberOfApartments); } }